The critical behavior in antiperovskite compound Fe3.4In0.6N

•We have characterized the antiperovskite Fe3.4In0.6N systematically.•We find that Fe3.4In0.6N shows a second-order magnetic transition.•Critical exponents β, γ and δ are close to the theoretical prediction of the mean-field (MF) model.•Indium doping leads to the ferromagnetic and anti-ferromagnetic interactions, also the magnetic disorders. The critical behavior of the antiperovskite crystal Fe3.4In0.6N has been systematically studied in this paper. We have used a modified Arrott plot, the Kouvel-Fisher method, and critical isotherm analysis to obtain the critical exponents (β, γ and δ) which suggest that a long-range magnetic coupling described by mean-field (MF) theoretical model is dominant in Fe3.4In0.6N. The experimental M−T−H relations below and above Curie temperature (Tc) collapse into two branches by the single scaling equation m = f±(h) (m and h are renormalized magnetization and field), respectively. The critical exponents are confirmed by the Widom scaling law δ = 1 + γβ−1. In addition, it is suggested that the ferromagnetic (FM), anti-ferromagnetic (AFM) interactions and the magnetic disorders result to the exchange distance which is obtained just as J(r)∝r-4.4.